Herbicidal N-[4-(3'-alkoxyphenoxy)-phenyl]-N'-methylureas

US4376646A · kind A · utility

Assignee

• Ciba-Geigy · US

Inventors

• Otto Rohr · Therwil, CH
• Georg Pissiotas · Lörrach, DE

Key dates

• Filing date: Mar 6, 1981
• Grant date: Mar 15, 1983
• Expiry date: Mar 6, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C275/64
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Novel ureas of the formula I have herbicidal activity and are suitable in small applied amounts for selectively combating weeds in cultivated crops of soya-bean, maize and cereals. They are advantgeously produced by the isocyanate method and correspond to the formula I ##STR1## wherein R.sub.1 is an unsubstituted or substituted C.sub.1 -C.sub.6 -alkyl, C.sub.2 -C.sub.6 -alkenyl, C.sub.2 -C.sub.6 -alkynyl, aralkyl, phenyl, acyl or C.sub.1 -C.sub.4 -alkylsulfonyl group or an aminoalkyl group, PA0 R.sub.2 is hydrogen, halogen, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy, PA0 R.sub.3 is hydrogen, halogen, cyano or trifluoromethyl, PA0 R.sub.4 is hydrogen, C.sub.1 -C.sub.6 -alkyl, C.sub.2 -C.sub.6 -alkenyl, C.sub.2 -C.sub.6 -alkynyl or C.sub.1 -C.sub.6 -alkoxy, PA0 R.sub.5 is hydrogen, C.sub.1 -C.sub.6 -alkyl or C.sub.2 -C.sub.6 -alkenyl, or R.sub.5 together with R.sub.4 and the nitrogen atom to which they are bound also form a 5-6-membered heterocycle, and PA0 X is oxygen, sulfur or the sulfinyl or sulfonyl group.